Installed an Rare Breed FRT trigger in my S&W AR.
Had to swap out the factory BCG & replace it with a full auto M16 BCG.
Everything went together perfectly. The trigger absolutely rocks.
HOWEVER:
After disassembling for cleaning, the upper & lower refuse to close.
There's a ⅛" gap between the two receivers at the rear takedown pin location.
When I first installed the new trigger setup, I think I was able to push the bolt itself into the carrier assembly. That allowed enough clearance for the 2 receivers to close properly.
Repeating that act doesn't seem possible now.
I'm open to everyone's input & advice.
AND:
For those who have yet to try one of the new FRT triggers (Rare Breed or Big Daddy's Wide Open Trigger), do yourself a favor, get one while you still can !